Evidence map›Paper›PMID 28723952›Full record

ArticlePloS one2017

Evidence for prehistoric origins of the G2019S mutation in the North African Berber population.

Rafiqua Ben El Haj, Ayyoub Salmi, Wafa Regragui, Ahmed Moussa, Naima Bouslam, Houyam Tibar, Ali Benomar, Mohamed Yahyaoui, Ahmed Bouhouche

Abstract read
In one paragraph

Article in PloS one, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

15 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Genetic Landscape of Monogenic Parkinson's Disease in the African Population-A Systematic Review.Movement disorders : official journal of the Movement Disorder Society · 2026
    Pooled it
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  5. Absence of theFrontiers in aging neuroscience · 2025
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  15. A perceptive plus in Parkinson's disease.Movement disorders : official journal of the Movement Disorder Society · 2018
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Rafiqua Ben El HajResearch Team in Neurology and Neurogenetics, Genomics Center of Human Pathologies, Medical School and Pharmacy, Mohammed V University, Rabat, Morocco.
Ayyoub SalmiLaboratory of Information and Communication Technologies, National School of Applied Sciences, Abdelmalek Essaadi University, Tanger, Morocco.
Wafa RegraguiResearch Team in Neurology and Neurogenetics, Genomics Center of Human Pathologies, Medical School and Pharmacy, Mohammed V University, Rabat, Morocco.
Ahmed MoussaLaboratory of Information and Communication Technologies, National School of Applied Sciences, Abdelmalek Essaadi University, Tanger, Morocco.
Naima BouslamDepartment of Neurology and Neurogenetics, Specialties Hospital, IBN Sina University Hospital Center, Rabat, Morocco.
Houyam TibarResearch Team in Neurology and Neurogenetics, Genomics Center of Human Pathologies, Medical School and Pharmacy, Mohammed V University, Rabat, Morocco.
Ali BenomarResearch Team in Neurology and Neurogenetics, Genomics Center of Human Pathologies, Medical School and Pharmacy, Mohammed V University, Rabat, Morocco.
Mohamed YahyaouiResearch Team in Neurology and Neurogenetics, Genomics Center of Human Pathologies, Medical School and Pharmacy, Mohammed V University, Rabat, Morocco.
Ahmed BouhoucheResearch Team in Neurology and Neurogenetics, Genomics Center of Human Pathologies, Medical School and Pharmacy, Mohammed V University, Rabat, Morocco.ORCID http://orcid.org/0000-0001-5279-8649

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The most common cause of the monogenic form of Parkinson's disease known so far is the G2019S mutation of the leucine-rich repeat kinase 2 (LRRK2) gene. Its frequency varies greatly among ethnic groups and geographic regions ranging from less than 0.1% in Asia to 40% in North Africa. This mutation has three distinct haplotypes; haplotype 1 being the oldest and most common. Recent studies have dated haplotype 1 of the G2019S mutation to about 4000 years ago, but it remains controversial whether the mutation has a Near-Eastern or Moroccan-Berber ancestral origin. To decipher this evolutionary history, we genotyped 10 microsatellite markers spanning a region of 11.27 Mb in a total of 57 unrelated Moroccan PD patients carrying the G2019S mutation for which the Berber or Arab origin was established over 3 generations based on spoken language. We estimated the age of the most recent common ancestor for the 36 Arab-speaking and the 15 Berber-speaking G2019S carriers using the likelihood-based method with a mutation rate of 10-4. Data analysis suggests that the shortest haplotype originated in a patient of Berber ethnicity. The common founder was estimated to have lived 159 generations ago (95% CI 116-224) for Arab patients, and 200 generations ago (95% CI 123-348) for Berber patients. Then, 29 native North African males carrying the mutation were assessed for specific uniparental markers by sequencing the Y-chromosome (E-M81, E-M78, and M-267) and mitochondrial DNA (mtDNA) hypervariable regions (HV1 and HV2) to examine paternal and maternal contributions, respectively. Results showed that the autochthonous genetic component reached 76% for mtDNA (Eurasian and north African haplogroups) and 59% for the Y-chromosome (E-M81 and E-M78), suggesting that the G2019S mutation may have arisen in an autochthonous DNA pool. Therefore, we conclude that LRRK2 G2019S mutation most likely originated in a Berber founder who lived at least 5000 years ago (95% CI 3075-8700).

Indexed as

HaplotypesAdultAfrica, NorthernAgedAged, 80 and overArabsDNA, MitochondrialGene FrequencyGenetic Predisposition to DiseaseGenotypeHumansLeucine-Rich Repeat Serine-Threonine Protein Kinase-2Middle AgedMutationParkinson DiseaseDNA, MitochondrialLeucine-Rich Repeat Serine-Threonine Protein Kinase-2

Identifiers

PMID28723952
PMCPMC5517005

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.